AutoCodes – RAM – P0303 RAM

P0303 RAM Code - Cylinder Misfire Fault Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #3, Clogged or faulty Fuel Injector #3, Faulty Ignition Coil #3. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0303 RAM indicates Cylinder Misfire Fault Detected .
Common causes: Common causes include Faulty Spark Plug #3, Clogged or faulty Fuel Injector #3, Faulty Ignition Coil #3.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,275

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 02, 2021

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0303 RAM Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

OBDII Code P0303 RAM - Cylinder Misfire Fault Detected - AutoCodes.com — P0303 RAM Code - Cylinder Misfire Fault Detected

What does this mean?

What are the Possible Causes of the DTC P0303 RAM?

Faulty Spark Plug #3
Clogged or faulty Fuel Injector #3
Faulty Ignition Coil #3
Fuel Injector #3 harness is open or shorted
Fuel Injector #3 circuit poor electrical connection
Ignition Coil #3 harness is open or shorted
Ignition Coil #3 circuit poor electrical connection
Insufficient cylinder 3 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0303 RAM?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0303 code means that cylinder 3 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0303 RAM code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0303 RAM Code

1. What are the common symptoms of OBDII code P0303?

- Common symptoms include engine misfires, rough idling, loss of power, and potential hesitation during acceleration.

2. What are the possible causes of a P0303 code?

- The code P0303 typically indicates a misfire in cylinder 3, which can be caused by issues such as faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, or low compression.

3. How can I diagnose the cause of a cylinder misfire for code P0303?

- Diagnostic steps may include checking spark plugs, ignition coils, fuel injectors, compression levels, and conducting a visual inspection for any visible issues in cylinder 3.

4. What are some repair tips for addressing a P0303 code?

- Repair options may include replacing spark plugs, ignition coils, or fuel injectors in cylinder 3, fixing vacuum leaks, performing a compression test, and ensuring proper engine timing.

5. Can a dirty or clogged fuel injector cause a P0303 code?

- Yes, a dirty or clogged fuel injector in cylinder 3 can disrupt fuel delivery, leading to a lean condition and potential misfire triggering the P0303 code.

6. Is it safe to continue driving with a P0303 code present?

- It is not recommended to drive with a P0303 code as it can lead to further damage to the engine and other components if left unresolved.

7. Can a P0303 code be triggered by a simple issue like a loose gas cap?

- While a loose gas cap can trigger a different code related to the evaporative emissions system, it is less likely to cause a P0303 code specifically related to cylinder misfires.

8. How important is it to address a P0303 code promptly?

- It is crucial to address a P0303 code promptly to prevent potential engine damage, poor fuel economy, and drivability issues.

9. Will resetting the OBDII system clear a P0303 code?

- Resetting the OBDII system may clear the code temporarily, but if the underlying issue causing the misfire is not addressed, the code is likely to reappear.

10. Can extreme weather conditions impact the likelihood of a P0303 code appearing?

- Extreme weather conditions, such as very cold temperatures affecting spark plug performance or extreme heat causing vapor lock, can potentially contribute to triggering a P0303 code.